Spatial distribution, biomass and size structure of Ctenodiscus australis (Echinodermata: Asteroidea) in shelf-break areas, Argentine

Chaetopterus antarcticus (Polychaeta: Chaetopteridae) in Argentinian shelf scallop beds: from infaunal to epifaunal life habits

“…This commercial resource and the invertebrate by-catch are yearly monitored as part of the scallop management plan. Early research on composition and structure of the by-catch in the spatial and temporal scales (Bremec & Lasta, 2002;Escolar, Diez, Hernandez, Campodónico, & Bremec, 2009;Escolar, Hernández, & Bremec, 2011;Mauna, Acha, Lasta, & Iribarne, 2011;Schejter et al, 2012;Schejter, Bremec, Escolar & Giberto, 2017), production and trophic interactions (Bremec, Brey, Lasta, Valero, & Lucifora, 2000;Schejter, Bremec, Akselman, Hernandez, & Spivak, 2002;Botto et al, 2006;Souto, 2009) showed the high frequency and abundance of the parchment worm Chaetopterus antarcticus Kinberg, 1866 (see Moore, Nishi, & Rouse, 2017) between 37º S and 40º S, associated to the commercial scallop. This polychaete was usually collected within its free U tubes, typical of infaunal habit (see Rouse, 2001;Nishi, Hickman, & Bailey-Brock, 2009) (Fig.…”